bug#54834: 29.0.50; Problems with M-x dirs

[Tassilo Horn]

Problem number one is this error:

1. emacs -Q
2. M-x shell RET
3. M-x dirs RET
=> Error: dirs: Symbol’s function definition is void: string-chop-newline

This only happens with emacs 29 (current git master).

The second problem is that M-x dirs seems to infloop when the required
functions have been defined and this also happens with emacs 28.1:

1. emacs -Q
2. M-x shell RET
3. M-x dirs RET

Emacs hangs and uses 100% of one core.  Apparently, this seems to happen
only when the underlying shell is fish.  When I type the dirs command in
*shell* manually, that's what I see:

~ $ dirs  # prompt & what I've typed
~ $ dirs  # seems to be echoed for some unknown reason
~         # the actual dirs output
~ $       # the new prompt

The echoing of the prompt and command doesn't happen when I have an
interactive fish shell in the terminal with

   env TERM=dumb INSIDE_EMACS=emacs fish

I've also tried setting `comint-process-echoes' to t but that doesn't
help.  I've tried debugging `dirs` aka `shell-resync-dirs'.  When I'm in
~ and the prompt is "~ $" and I run M-x dirs, we're looping in the last
`(while newelt' loop where newelt is and stays "^M~ $ dirs^M".  When I
C-g, what I see in the *shell* buffer is just

  ~ $ dirs

i.e., my original prompt where the command has inserted "dirs" but the
output of the command is only printed after I C-g.  So it seems M-x dirs
tries to parse the output before it has actually appeared.

As said, this only happens with fish but not bash or zsh.


In GNU Emacs 29.0.50 (build 7, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo 
version 1.17.6)
 of 2022-04-10 built on thinkpad-t440p
Repository revision: f29fd102d7531619a98acbf0f3e012fb0f6b233f
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --with-pgtk --with-native-compilation --with-xinput2'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XIM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: mu4e:main

Minor modes in effect:
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  auto-encryption-mode: t
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  overwrite-mode: overwrite-mode-binary

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/home/horn/.emacs.d/elpa/transient-20220406.1156/transient hides 
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